http://www2.fpl.fs.fed.us/ great website to learn more about Wood Anatomy Research, Wood Identification, Wood Properties and much more. World's largest research wood collection is at FPL, Forest Products Laboratory. It includes old Yale University's Samuel James Record, old Field Museum in Chicago and Madison collections.
Jarrah is one of the most common species of Eucalyptus tree in southwest of Western Australia. The jarrah tree can live as long as 500 years. Coarse-textured, with heavily interlocked grain, Jarrah Burl is difficult to work with hand and power tools and dulls tooling fairly quickly.
Australian Brown Mallee Burl is an extremely dense burl. Hard and heavy, feels more like a polished marble than wood.
Beeswing Narra is a highly figured wood from the Narra tree in Southeast Asia. A very tough wood. Same tree produces Amboyna Burl.
Ziricote is the most dramatic member of the Cordia genus, which grows throughout Central and tropical South America. The heartwood is dull brown with irregular dark brown and black streaking, and the sapwood is creamy white to light golden tan. A pleasing ray or fleck figure is visible in quartersawn stock. Ziricote's grain is generally straight, and its texture is medium to coarse.